How can to change verts values in the curve model?
In general, you can't directly affect the vertices created by curves without writing those curves to mesh (alt c -> mesh from curve.)

However, you can increase or decrease the number of vertices created by a curve.  Increasing the resolution of the curve in properties/data/shape will create additional vertices along the length of a curve.  If your curve has a bevel, increasing its resolution creates additional vertices along the radius of the bevel.  If your object is using a bevel object, you can change the resolution of the bevel object instead.